46 Transactions Texas Academy of Science. [92] 
as measured on December 18, 1900, by current meter, was 10.3 sec- 
ond-feet. The measurement was made just below the ford and about 400 
feet below the bath house at the spring. The dam of the electric light 
plant, which is a little over half a mile below the spring, backs the water 
up to within 200 yards of the spring itself. The flow of the spring, as 
stated by the citizens, is reliably constant. 
The Hanna spring is about one-fourth of a mile N. 20 E. from the 
court house and almost on the opposite side from the Hancock. It rises 
in a large pool, sixty feet in diameter, which has been constructed of 
stone and cement. The water flows out of a pool over an inclined apron 
and can be diverted to the large bath house nearby. The stream formed 
by the spring has been diverted from its original channel and is conveyed 
partly underground for over 200 yards, but at certain places the stream 
is visible through boxes placed in its course and whose sides project above 
the surface of the ground. At one of these boxes the flow of the Hanna 
spring was found to he four second-feet on December 19, 1900. The 
Hanna spring is strongly impregnated with sulphur. 
The waters of the springs are utilized by various power plants. There 
are three dams across the stream within a mile and a half of Lampasas. 
The electric light plant is in the suburbs of Lampasas and has a stone 
dam of eighteen feet in height above foundation bed and fourteen feet 
above the river bed, and 150 feet long. The water is conveyed hy a race 
nearly 300 yards long to the, power house, where a fall of fourteen feet 
is obtained. The waters above this stone dam are held back during the 
day and used only at night, but the lake above the dam fills up and the 
water begins to flow over the dam shortly after midday. A judicious use 
of dashboards would render more power ' available. A flow of one cubic 
foot of water with an efficiency of seventy-five per cent, would give a 
continuous horse power of one and one-half, or a total of twelve horse 
power used continuously, or a total of twenty-eight and eight-tenth if 
used for only ten hours during the day and held back for fourteen. An 
auxiliary steam engine is used at the power plant to reinforce the water 
power when heavy demands are made for power. 
The second dam belongs to W. T. Donovan & Sons and is about three- 
fourths of a mile below the stone dam. It is an old-fashioned wooden 
dam, 120 feet long, and gives a fall of eleven feet. Triangular frame 
bents are constructed with the inclined braces up stream. To these braces 
sheeting is nailed, which forms the up stream face of the dam. With a 
good hydraulic wheel one second-foot of flow should give one horse power 
at the dam. -The power is used here by the Donovan Flour Mill, but the 
flow of the stream is under the control of the upper dam to such an 
extent that a gasoline engine is used as an auxiliary power. 
The lower dam,, about one mile below the Donovan dam, belongs to 
Bradley Brothers. It is a wooden structure, composed of cedar post 
